JP2002064772A - Video transfer system, video transfer method, and video server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video transfer system that can easily transfer video data between video servers. SOLUTION: The video servers 1, 3 connected by the Internet are both configured as FTP(file transfer protocol) severs. In the case of transferring AV data from the server 1 to the server 3, a computer 2 controlling the server 1 makes communication with a computer 4 controlling the server 3, to check whether the AV data transferred from the server 3 are acceptable. If the AV data are acceptable, the computer 2 transmits a command 'PASV' to the server 1, to allow the server 1 to inform the computer 2 about the IP address of an idle communication port. The IP address is sent to the computer 4, which transmits a command 'PORT' to the server 3 on the basis of this IP address to set a communication port of the server 3. The AV data, reproduced by the server 1 under the control of the computer 2, are sent from the IP address noticed by the command 'PASV'. The server 3 receives the AV data, on the basis of the setting of the communication port by the command 'PORT'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video transfer system and a video transfer method for easily transferring video data between video servers, and a video server.

[0002]

2. Description of the Related Art At present, a video server which stores a large amount of video data in a large-capacity recording medium, retrieves the stored video data based on a request, and transfers the retrieved video data to the outside is becoming widespread. As a recording medium for video data, in addition to a conventional video tape and a changer device capable of storing a large number of video tapes, a hard disk drive or the like has recently been increasingly used. The video data read from the video server is used for broadcasting, distribution, and the like after, for example, editing processing. Further, the video data is transferred from the video server to another video server located at a remote place, for example, and stored in the other video server.

Here, a case where video data is transferred from a video server to another video server will be considered. FIG. 9 conceptually shows a conventional system. FIG. 9 shows that the video server 300
1 is a system for transferring video data. The transfer source video server 300 and the transfer destination video server 301 are controlled and monitored by computer devices 302 and 303, respectively. The video servers 300 and 301 are network-connected by, for example, Ethernet (registered trademark) or the Internet.

In this configuration, when video data is transferred from the video server 300 to the video server 301,
Conventionally, the computer device 302 controls all of the transfer processing. On the other hand, the computer device 303 controls the video server 301 and periodically monitors the video server 301 to determine whether the video data transferred from the video server 300 has been received.

[0005] In the example of FIG. 9, communication is performed between the video servers 300 and 301 using TCP / IP as a communication protocol. To transfer video data, FTP (File Tr
ansfer Protocol) is used.

The transfer processing performed based on the FTP command will be schematically described. First, the computer device 3
02 is logged into the video server 300, and a command “GET” by FTP is passed from the computer device 302 to the video server 300. In response to the command “GET”, the specified video data is transferred from the video server 300 to the computer 302, and
02 is temporarily stored in a large-capacity recording medium included in the storage medium 02.

Next, an FTP command “PUT” is passed from the computer device 302 to the video server 301. At the same time, a command requesting the video server 301 to be controlled in a predetermined manner is passed from the computer device 302 to the computer device 303. By the command “PUT”, the video data transferred from the video server 300 and stored in the computer device 302 is
The video is transferred to the video server 301.

The computer device 303 periodically monitors the video server 301, and
Check the increase or decrease of the data in the or, separately,
The video data transfer to the video server 301 can be known by receiving a notification of the video data transfer from the computer device 302 or the like.

[0009]

Conventionally, the transfer of video data from the video server 300 to the video server 301 has been performed once via the computer 302 as described above. For this reason, there has been a problem that extra time is required for the transfer. At the same time, there is a problem that the computer device 302 needs to be provided with a large-capacity recording medium capable of storing video data to be transferred.

When transferring video data, two IP addresses, that is, an IP address of a video server 301 as a transfer destination and an IP address of a computer 303 for controlling the operation of the video server 301 are entered into the computer 302. Had to be specified above. Therefore, there was a problem that the operation in the computer device 302 was complicated.

It is therefore an object of the present invention to provide a video transfer system, a video transfer method, and a video server which can easily transfer video data between video servers.

[0012]

According to the present invention, there is provided a video data transfer system for transferring video data from a first video server to a second video server. Control the first
A second control means for controlling the second video server, capable of communicating with the first control means,
Communication means for transferring video data between the video server and the second video server, and when the video data is transferred by the communication means, the first control means causes the first video server to transmit the video data via the communication means. To notify the first video server of a communication port through which video data can be transferred, and notifies the notified communication port to the second control means.
The communication port notified from the control means is set to the second video server, and the video data is directly transmitted from the first video server to the second video server using the set communication port. The video transfer system is characterized in that the video transfer system performs a video transfer.

Further, the present invention provides a video data transfer method for transferring video data from a first video server to a second video server, wherein a first control step for controlling the first video server; Control the video server, the first control step and the second controllable communication with each other.
And a communication step of transferring video data between the first and second video servers. When the video data is transferred by the communication step,
In the first control step, the first video server notifies the first video server of a communication port capable of transferring video data through the communication step, and notifies the notified communication port of the second control. Notifying the step, the second control step is configured to set the communication port notified from the first control step to the second video server, and the first video signal is set using the set communication port. Second from server
A video data transfer method for directly transferring video data to a video server.

According to the present invention, there is provided a video server capable of storing video data supplied via communication and transferring the stored video data to the outside via communication, by using a predetermined communication protocol. Communication means capable of transferring video data to the outside and receiving video data transferred from the outside; encoding means for encoding video data in a predetermined format; and video data encoded in a predetermined format Means for decoding the video data, storage means for storing the video data, and, when the video data is transferred by the communication means, monitors the mounting state of the communication means, the encoding means, and the decoding means. And a control means for controlling transfer.

As described above, according to the first and sixth aspects of the present invention, when video data is transferred from the first video server to the second video server via communication, control of the first video server is performed. The first video server notifies the first video server of the available communication port, and transmits the notified available communication port to the second control means for controlling the second video server. Since the control means sets an empty communication port for the second video server, transfer of video data from the first video server to the second video server is performed using the set communication port. The control can be performed directly, and the control can be performed only by performing a predetermined exchange between the first and second control means.

According to a seventh aspect of the present invention, when video data is transferred by communication performed based on a predetermined communication protocol, the mounting state of the communication unit, the encoding unit, and the decoding unit is monitored and the mounting state is changed. Since the transfer is controlled based on the transfer, abnormal processing in the transfer destination video server can be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 conceptually shows a video data transfer system according to the present invention. Video server 1 capable of storing and storing a large number of video data
Is controlled by the computer device 2. Similarly, a video server 3 located at a remote location from the video server 1 and capable of storing and storing a large amount of video data is controlled by a computer device 4.

On the other hand, the computer device 2 and the computer device 4 are connected by a communication network so that they can communicate with each other. Similarly, the video server 1 and the video server 3 are connected by a communication network,
They can communicate with each other. Video server 1
And 3 are capable of exchanging video data via the communication network.

In this embodiment, the video server 1,
The communication network connecting the computer device 2, the video server 3, and the computer device 4 is TC
P / IP (Tranmission Control Protocol / Internet Pro)
tocol) as a communication protocol, and FTP (File Tran
sfer protocol) is available. For example, video servers 1 and 3 and computer device 2
And 4 are each connected via the Internet.

In this embodiment, each of the video servers 1 and 3 is configured as an FTP server. Therefore, for example, the computer device 2
The user can access the video server 1 by logging in to the video server 1 based on the connection procedure specified in the FTP. This is the same for the video server 3 and the computer 4.

Each of the computer devices 2 and 4 has a general configuration as a computer device. For example, a CPU (Central Processing Unit), a memory, a hard disk drive, a graphic controller, an input device, a communication interface, etc. And a monitor device is connected to the graphic controller. Various processes such as display on the monitor device and communication through the communication interface are controlled by the control of the CPU based on the predetermined program. The configuration of the video servers 1 and 3 will be described later.

In such a configuration, when the computer devices 2 and 4 communicate with each other, the video server 1
And transfer of video data between the first and third video data. For example, the computer 2 logs in to the video server 1 and the computer 2
A transfer request is issued to transfer the video data stored in the video server 1 to the video server 3. At the same time, the computer device 2 notifies the computer device 4 that video data is to be transferred from the video server 1 to the video server 3. In the computer device 4, based on this notification, the video server 3 is set to be able to receive the transferred video data.

In this embodiment, the commands "PASV" and "PORT" specified in the FTP are used for the transfer request and the reception setting. With the commands “PASV” and “PORT”, a communication path between the video server 1 and the video server 3 is established, and video data can be directly transferred from the video server 1 to the video server 3.

As described above, according to the present invention, the video data to be transferred is not temporarily stored in the hard disk drive or the like of the computer device 2, so that the video data can be transferred without extra work. Further, since no communication is performed between the computer device connected to the video server of the transfer source and the video server of the transfer destination, the cost for communication can be reduced.

FIG. 2 shows an example of the configuration of the video server 1. In this example, the video server 1 includes a video storage unit 10 that performs overall control and encodes and decodes video data, and a storage unit 50 that stores and accumulates video data. The signal generator (SG) 30 is connected to an external digital VTR 40
And a common reference signal to the video server 1 (video store unit 10). With the digital VTR 40,
Video data and audio data reproduced on the basis of the reference signal (hereinafter collectively referred to as AV data) are output in a format of SDI (Serial Data Interface) and supplied to the video store unit 10 of the video server 1.

The video store unit 10 can mount a plurality of encoding and decoding means. This figure 2
In the example of MPEG2 (Moving Pictures Experts Group
2) An encoder 11, an encoder / decoder 13, and decoders 12A to 12C for performing an encoding process or a decoding process of AV data by using the method are mounted in the video store unit 10. These encoder 11, encoder / decoder 13 and decoder 12A
12C are connected to a system board 14 for controlling the entire video server 1 by, for example, PCI (Peripheral Componen).
t Interconnect) as an interface. The encoder 11, the encoder / decoder 13, and the decoders 12A to 12C perform encoding or decoding of AV data while communicating with the system board 14 via the PCI bus.

In such a system, the video store unit 10 cascade-connects boards having encoding and decoding functions, such as an encoder 11, an encoder / decoder 13, and decoders 12A to 12C.
The number of supported channels can be increased, for example, up to 20 channels. Further, communication control is performed with the computer device 2, and the encoder 11, the encoder /
Information on the mounting state of the decoder 13 and the decoders 12A to 12C is also notified to the computer device 2 via the system board 14. Thus, the video server (and video server 3) used in this embodiment
Is a system in which an encoder and a decoder can be appropriately mounted, and a plurality of recordings and transmissions are enabled.

The compression coding method of AV data is M
Not only PEG2 but also other systems can be used. Also, AV data may be handled without compression encoding.

The storage unit 50 has a large-capacity recording medium, and receives AV data supplied from the outside as it is, or AV data that has been encoded or decoded by the encoder 11, the encoder / decoder 13, and the decoders 12A to 12C. Store and store data. The stored AV data can be freely read out under the control of the system board 14 based on instructions from the computer device 2.

As the large-capacity recording medium in the storage unit 50, for example, a hard disk drive can be used. In the example of FIG. 2, a hard disk array including five hard disk drives 52A to 52E is
It is used as a large-capacity recording medium for storing AV data. These five hard disk drives 5
2A to 52E are controlled by the hard disk controller 51 to operate in association with each other. The hard disk controller 51 is connected to the system board 14 by a PCI bus.

The system board 14 is, for example, RS-23
It is connected to the computer device 2 using 2C as an interface. Using the RS-232C, the computer device 2 and the video server 1 communicate with each other, so that the computer device 2 can control the video server 1 and notify the computer device 2 of the status from the video server 1. In this communication,
It is possible to use FTP.

Further, the video store section 10 has a communication I / F section 60 connectable to a predetermined network such as Ethernet. The video server 1 and the computer device 2 communicate with each other via the communication I / F unit 60, and perform control of the video server 1 by the computer device 2, notification of status from the video server 1 to the computer device 2, and the like. be able to. The communication by the communication I / F 60 can use FTP.

Further, the communication I / F unit 60 can communicate with another video server such as the above-described video server 3 corresponding to the communication interface. For example, the communication I / F 60 from the computer device 2
The AV data is read from the storage unit 50 under the control of the system board 14 based on the instruction via the system board 14, and the read AV data is supplied to the communication I / F 60 via the system board 14. In the communication I / F unit 60,
The communication control is performed in a predetermined manner, and the supplied AV data is transmitted to the outside. Similarly, it is possible to control so that AV data transmitted from the outside is received by the communication I / F unit 60 and stored and stored in the storage unit 50.

The computer device 2 has a management control means 20, which is software for managing and controlling the video server 1. The management control means 20 has an OS (Operating System) function capable of performing multiple processing (for example, multi-threading) for a plurality of applications (for example, threads) in order to simultaneously control a plurality of channels.

The video server 3 and the computer device 4 have the same configuration as the video server 1 and the computer device 2, respectively, and thus detailed description is omitted.

An operation on the computer device 2 on the transfer source side for transferring video data according to the present invention will be described with reference to FIGS. A series of operations is performed on a GUI (Graph
ical User Interface). FIG. 3 shows an example of a GUI for setting an address of the transfer destination video server 3 on the network. In the computer device 2, based on the address of the video server 3 on the network, “IP Address”, “SubNet”
Mask "and" Default Gateway "
Set each item of. By pressing the "OK" button, the set contents are stored in the computer device 2, and the set contents are determined. When the “Cancel” button is pressed, the setting window is closed without saving the settings.

FIG. 4 shows an example of a GUI for setting an address on the network of the computer device 4 for controlling the video server 3 of the transfer destination. In the computer device 2, “IP Address” is set based on the address of the computer device 4 on the network.
In “Place”, the name of the transfer destination can be input as appropriate. By pressing the "OK" button, the set contents are stored in the computer device 2, and the set contents are determined. When the “Cancel” button is pressed, the setting window is closed without saving the settings.

FIG. 5 shows an example of a GUI for managing the network address of the computer 4 that controls the video server 3 of the transfer destination. The contents already set in the computer device 2 are displayed in a list on the display unit 70.
When the “Add List” button 71 is pressed, the above-described FIG.
Is displayed, and a new address can be added to the list. When the “Change” button 72 is pressed while any of the information displayed on the list is selected, the above-described GUI of FIG. 3 is displayed with the selected address information displayed, and the setting is already performed. Can be changed. When the "Delete" button 73 is pressed while any of the information displayed in the list is selected, the selected address information can be deleted. By pressing the "OK" button, the set contents are stored in the computer device 2, and the set contents are determined. When the “Cancel” button is pressed, the setting window is closed without saving the settings.

FIG. 6 shows an example of a GUI for setting the transfer of AV data from the video server 1 to the video server 3. A list of AV data stored in the video server 1 is displayed on the display unit 74 in a list. In the example of FIG.
A unique “Clip ID” for each AV data, A
“Title” which is the title of the V data, “Description” which is a brief description of the AV data,
Items “Duration” indicating the length of the AV data and “Rate” indicating the data rate of the AV data are displayed. Each AV data is “Clip
ID ". The display contents of the display unit 74 can be rearranged according to the items displayed as a drop-down list on the display unit 79.

In the drop-down list of the display unit 80,
A list of video server names that can be specified as transfer destinations is displayed. For example, a video server of a transfer destination can be selected and set from the video servers displayed in FIG. 5 described above. By pressing the “Destination Set” button 77, the above-described GUI of FIG. 5 is displayed, and the registered contents of the video server can be edited.
"OverWriteDuplicate Clip"
Is checked, the Clip of the AV data to be transferred is checked.
When the AV data having the same ID as the ID is set as the transfer destination, the transferred AV data is overwritten on the data.

By selecting data to be transferred from the AV data displayed on the display unit 74 and pressing a button 75, the selected AV data is displayed on the video server of the transfer destination selected by the display unit 80. Forwarded to.
A plurality of AV data to be transferred can be selected on the display unit 74. The transferred AV data is displayed on the display unit 76. Also, choose to forward,
The number of AV data not yet transferred is displayed on the display unit 78. By pressing the “Cancel” button 81 during the transfer of the AV data, the transfer of the AV data can be interrupted.

In the above description, the GUI shown in FIGS.
Although the description has been made on the assumption that the functions corresponding thereto are mounted on the video server 1, these GUIs and functions can also be mounted on the video server 3.

Next, the AV data transfer processing according to the present invention will be described in more detail. FIG. 7 shows an example communication sequence according to the embodiment. In this embodiment, communication is performed between the computer devices 2 and 4, between the computer device 2 and the video server 1, and between the computer device 4 and the video server 3, and AV data from the video server 1 to the video server 3 is transmitted. Achieve the transfer of. As will be described later, management is facilitated by treating the message as it is as a state management value.

Computer device 2 and computer device 4
The data is exchanged with the data structure shown in FIG. In FIG. 8, “//” indicates that the content described after that line is a comment and is not used as data. Comments are optional. “Len” has a length of 32 bits and indicates a byte length exchanged at one time.

"Message" has a length of 32 bits, stores type data for exchanging between computer devices, and stores a state management value. For example, information indicating the type of data to be transferred, such as whether the data to be transferred is video data or another type of file, is stored in the upper 16 bits of “message”. In the lower 16 bits, a state management value is stored. The state management value is, for example, a value described in parentheses () in the communication sequence diagram of FIG. For example, each device is instructed on the next state to be transitioned based on the received state management value.

"Ext_message" has a length of 32 bits, and stores type data when the above-mentioned "message" alone is insufficient or when no state transition occurs.

The row marked "BYTE data" in the comment is an area for exchanging information with 8-bit data.

In FIG. 7, a video server 1 as a transfer source, a computer device 2 for controlling the video server 1, a video server 3 as a transfer destination, and a computer device 4 for controlling the video server 3 are shown from the left. In FIG. 7, a sequence includes a connection sequence for connecting each device, a transfer sequence for transferring video data, an interruption sequence for interrupting the transfer of video data, and a disconnection sequence for disconnecting each device. It is written separately.

As described above, in this embodiment, each of the video servers 1 and 3 is handled as an FTP server. Therefore, the computer device 2
Is the FTP client of the video server 1, and the computer device 4 is the FTP client of the video server 3. For example, in order to access the AV data stored in the video server 1 from the computer device 2, it is necessary to log in to the video server 1 from the computer device 2 as in a general FTP server. For example, at the time of login, the video server 1 is configured to input a predetermined user name and password.
Prompted by the side. Communication between the computer device 2 and the video server 1 and communication between the computer device 4 and the video server 3 are RFC (Req.
uest For Comments) This is performed using the FTP command specified in 959. In FIG. 7, a command enclosed in square brackets "" indicates that the command is an FTP command.

First, in the first sequence SEQ100 and SEQ101, a connection request is issued from the computer device 2 to the computer device 4 (SEQ100).
The connection confirmation is returned from the computer device 4 to the computer device 2 based on this request, whereby the connection between the computer device 2 and the computer device 4 is established.
At this time, I set in the GUI shown in FIG.
The computer device 2 and the computer device 4 are connected based on the P address.

The connection sequence will be described. TCP
According to the / IP procedure, the computer device 2 and the video server 1 are socket-connected in the sequences SEQ102 and SEQ103 based on the IP address set by the GUI shown in FIG. The socket connection is provided with a timeout period of, for example, 10 seconds, and the computer device 2 monitors whether the socket connection is completed within the timeout period. Next, in sequence SEQ103, the video server 1
, A user name is requested, and the sequence SEQ 104
Then, from the computer device 2 to the video server 1,
The command “USER” and the user name are transmitted. Subsequently, a password is requested from the video server 1 to the computer device 2 (SEQ105). On the other hand, the command “PASS” and the password are transmitted from the computer device 2 to the video server. If the video server 1 determines that the transmitted combination of the user name and the password is correct, the sequence S
In EQ 107, a notification to that effect is transmitted to the computer device 2.

When the computer device 2 logs in to the video server 1, the computer device 2 notifies the computer device 4 in sequence SEQ108. When this notification is received by the computer device 4,
In the sequence SEQ109 to SEQ114, the computer device 4 is logged in to the video server 3 in the same manner as described above. When the login is completed, a connection confirmation message is transmitted from the computer device 4 to the computer device 2 (SEQ 115).

The transfer sequence will be described. When the computer device 2 receives the connection confirmation from the computer device 4 in the above SEQ 115, the computer device 2
Is changed to a clip check request state, and a reception check request is transmitted from the computer apparatus 2 to the computer apparatus 4 (SEQ120). By this reception check request, information on the AV data transferred from the video server 1 to the video server 3 is notified from the computer device 2 to the computer device 4. Note that “clip” in FIG. 7 is synonymous with AV data (AV file).

In the computer device 4, the sequence SE
The AV data to be transferred is checked based on the reception check request received by Q120. For example,
Format information (PAL or NTSC) of video data in the AV data, the maximum number of transferred AV data, whether the transferred AV data is unregistered in the video server 3, the number of audio data transmission channels,
The contents such as whether a play list is displayed on the video server 3 and whether encoding processing is performed on the video server 3 are checked.
When the check is completed, a clip check confirmation is transmitted from the computer device 4 to the computer device 2 in a sequence SEQ121.

In the checking process in the computer device 4 based on the reception check request of the sequence SEQ 120, it is determined that the transferred AV data is inappropriate for storing in the video server 3, or If it is determined that No. 3 is not in a state in which the AV data is acceptable, the fact is notified by the clip check confirmation of SEQ121. Computer device 2
Then, upon receiving this notification, the state transition is made to a disconnection sequence described later.

On the other hand, if it is determined in the check processing by the sequence SEQ 120 that the transferred AV data can be stored in the video server, the sequence SE 120 is executed.
In Q122, the command “PASV” is transmitted from the computer apparatus 2 to the video server 1. The command “PASV” is a command for notifying an empty port of the transmission destination of the command “PASV”. Command "P
As an answer of "ASV", the free IP address (IP Add, x, x) of the video server 1 is returned to the computer 2 together with the number 227 (SEQ123). Note that (x, x) of the IP address indicates a predetermined address value.

The free IP address of the video server 1 returned to the computer device 2 is stored in the sequence SEQ124.
Is passed from the computer device 2 to the computer device 4, and a request for receiving IP address information is issued. The free IP address of the video server 1 passed by the computer device 4
Based on the address, a command “PORT” is transmitted to the video server 3 in a sequence SEQ125.
By the command “PORT”, the video server 3 is given an empty IP address (IP Add,
x, x) is set as a communication port, and a connection is established between the video server 1 and the video server 3 based on the IP address (IP Add, x, x).

In sequence SEQ126, the video server 3 communicates with the computer device 4 to confirm the setting of the communication port with the video server 1. Then, in the sequence SEQ127, the command “STOR” and the clip ID for identifying the AV data to be transferred are transmitted from the computer device 4 to the video server 3, and the video server 1 is instructed to prepare for the transfer of the AV data. When the preparation is completed in the video server 3, the video server 3 notifies the computer device 4 of the completion (SEQ128). In response to this, in the sequence SEQ129, the computer device 4 transmits the sequence SEQ
The reception confirmation corresponding to the reception request of 124 is notified.

When the acknowledgment is received by the computer 2, in sequence SEQ 130, the computer 2
Transmits a command “RETR” and a clip ID for identifying the AV data to be transferred to the video server 1, and instructs to prepare for the transfer of the AV data. When the transfer preparation is completed in the video server 1, the video server 1 notifies the computer device 2 that the transfer preparation is completed (SEQ131).

After the above series of sequences, the above-mentioned sequence SE from the video server 1 to the video server 3 is performed.
In Q123, transfer of AV data based on the IP address (IPAdd, x, x) passed from the video server 1 is started. The data transfer is performed by, for example, the computer device 2
Is instructed to reproduce the specified AV data from the video server 1, and the video server 1 reproduces the AV data based on the instruction. Played AV
The data is stored in the above-described sequences SEQ122 and SEQ122.
The IP address (IP Add, x,
x). This AV data is received and stored by the video server 3 whose communication port is set to the IP address (IP Add, x, x) in the above-described sequences SEQ125 and SEQ126.

The interruption sequence will be described. When the “Cancel” button 81 in the above-described GUI of FIG. 6 is pressed during the transfer of the AV data in the transfer sequence, the interruption sequence is started. When the “Cancel” button 81 is pressed on the computer device 2, a command “ABOR” is transmitted from the computer device 2 to the video server 1 in sequence SEQ 140, and a request to interrupt AV data transfer is issued. Based on this request, for example, the reproduction of the AV data is stopped in the video server 1 and the IP address (IP Add,
The output of AV data from (x, x) is interrupted. In the next sequence SEQ141, the video server 1 notifies the computer device 2 of the interruption confirmation based on the interruption request.

Video server 1 of sequence SEQ141
Is received by the computer device 2, the computer device 2 requests the computer device 4 to suspend the AV data reception by the video server 3 in the next sequence SEQ142. The computer apparatus 4 that has received the interruption request transmits a command “ABOR” to the video server 3 and issues a request to interrupt communication with the IP address (IP Add, x, x) (SEQ 143). . Based on the interruption request, the video server 3 notifies the computer device 4 of the interruption confirmation (EQ 144), and the computer device 4 that has received the interruption confirmation notifies the computer device 2 of the reception interruption confirmation (EQ 144). SEQ 145). When the reception interruption confirmation is received by the computer device 2,
The process proceeds to a cutting sequence described later.

Here, a video clip, ie, AV
Processing when data transfer is completed will be described. In the video server 1, for example,
When the data reaches the end of the data and the data transfer is completed, the video server 1 notifies the computer device 2 to that effect (SEQ150). If the video server 3 determines that the transfer of the AV data has been completed, the video server 3 notifies the computer device 4 of the termination (SEQ151). When this notification is received by the computer device 4, a notification that confirms that the AV data has been received is transmitted from the computer device 4 to the computer device 2 (SEQ).
145).

In the computer device 4, this SE
When the notification of Q151 is received, registration processing of the AV data transferred and stored in the video server 3 is performed. By this registration process, for example, the item of AV data transferred and stored in the video server 3 is added to the list display of the display unit 74 in the GUI of FIG.

The cutting sequence will be described. When the transfer process of the AV data from the video server 1 is completed due to the above-described interruption sequence or the end of the data due to the normal transfer process, the computer device 2 sends the video signal to the A command "QUIT" for instructing disconnection of communication with the server 1 is transmitted (SEQ160). This command "QUI
T ", the video server 1
A disconnection confirmation for confirming the disconnection of communication with the computer device 2 is notified (SEQ 161), and thereafter, the communication is disconnected.

In addition, for example, in parallel with the above-mentioned sequence SEQ 160, in sequence SEQ 162, the computer device 2 notifies the computer device 4 that the transfer of the AV data has been completed, and the computer device 4 and the video server 3 And a disconnection request for disconnecting communication with the server. When this is received by the computer device 4,
The above command “QUIT” is transmitted from the computer device 4 to the video server 3, and the command “QUIT” is transmitted.
The video server 3 that has received the "IT" notifies the disconnection confirmation for confirming the disconnection of the communication between the video server 3 and the computer device 4 (SEQ164), and thereafter, the communication is disconnected. Then, in sequence SEQ165, the connection confirmation is transmitted from the computer device 4 to the computer device 2.

In this way, when the transfer of the AV data from the video server 1 to the video server 3 is completed and the connection between the computer 2 and the video server 1 and the connection between the computer 4 and the video server 3 are disconnected, respectively, in a sequence SEQ 170, A disconnection request is transmitted from the computer device 2 to the computer device 4 so as to disconnect the connection between the computer device 2 and the computer device 4.

Note that the above-mentioned sequences SEQ100 to S
In the communication performed between the computer device 2 and the computer device 4 in the EQ 170, a state management value is transmitted from a communication source to a communication destination. The communication destination can know the next process to be performed based on the received state management value, and changes the state management value to a predetermined value at the time of the next transmission, and transmits it to the next communication destination.

As shown in FIG. 7, by exchanging data and performing negotiation between the computer devices 2 and 4 before transfer, it is known whether or not AV data can be transferred depending on the state of the video server 3 at the transfer destination. And the abnormal processing in the video server can be reduced. Also,
By exchanging the state management value between the computer devices 2 and 4, it is possible to easily support the interruption processing of AV data transfer processing, the retransmission processing, and the like.

[0070]

As described above, according to the present invention, the video server device is configured as an FTP server,
The commands “PASV” and “POR” of the TP command
T "is used to control the transfer of AV data between video servers. By this, AV between video servers
The data transfer is directly controlled, and there is no need to temporarily transfer the AV data to be transferred to a personal computer or the like, so that the transfer time can be shortened.

[0093] Therefore, there is an effect that a large-capacity recording medium for temporarily transferring AV data is not required.

Further, when transferring the AV data between the video servers, it is only necessary to specify the IP address of the computer controlling the transfer destination video server, so that the operability is improved.

Further, since it is not necessary to connect the computer device for controlling the video server of the transfer source and the video server of the transfer destination, there is an effect that the cost for communication can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram conceptually showing a system according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of an example of a video server.

FIG. 3 is a schematic diagram illustrating an example of a GUI for setting an address of a transfer destination video server on a network.

FIG. 4 is an example G for setting an address on a network of a computer device that controls a video server of a transfer destination.
FIG. 4 is a schematic diagram illustrating a UI.

FIG. 5 is a schematic diagram illustrating an example of a GUI for managing a network address of a computer device that controls a transfer destination video server.

FIG. 6 is a schematic diagram illustrating an example of a GUI for setting transfer of AV data between video servers.

FIG. 7 is a sequence chart showing an example of a communication sequence according to the embodiment;

FIG. 8 is a schematic diagram illustrating an example of a data structure exchanged between computer devices.

FIG. 9 is a schematic diagram conceptually showing a system according to the related art.

[Explanation of symbols]

1 ... video server, 2 ... computer device, 3
... Video server, 4 ... Computer device, 10
... Video store unit, 11 ... Encoder, 12a
12c: decoder, 13: encoder / decoder, 14: system board, 50: storage unit, 60: communication I / F

Claims (11)

[Claims] 1. A video data transfer system for transferring video data from a first video server to a second video server, wherein: first control means for controlling the first video server; and control for the second video server. A second control means capable of communicating with the first control means, and a communication means for transferring video data between the first and second video servers. In transferring the video data, the first control means causes the first video server to notify the first video server of a communication port through which the video data can be transferred via the communication means. Notifying the notified communication port to the second control means, the second control means setting the communication port notified from the first control means to the second video server. It is to way, by using the communication port set, the first
A video server for transferring the video data directly from the video server to the second video server. 2. The video data transfer system according to claim 1, wherein said first and second video servers implement FTP as a communication protocol, and said first video server, said first control means, And a communication between the second video server and the second control means is performed by the FTP, respectively. 3. The video data transfer system according to claim 1, wherein said first control means performs said video data transfer by said second video server in a pre-process for transferring said video data. A video data transfer system for checking whether or not the video data is acceptable. 4. The video data transfer system according to claim 3, wherein the format of the transferred video data is checked. 5. The video data transfer system according to claim 3, wherein the status of the second video server is checked. 6. A video data transfer method for transferring video data from a first video server to a second video server, comprising: a first control step of controlling the first video server; Controlling, the first control step and a second control step capable of communicating with each other, and a communication step of transferring video data between the first and second video servers. In transferring the video data by the communication step, the first control step includes the step of the first video server setting the communication port capable of transferring the video data through the communication step to the first communication port. And the notified communication port is notified to the second control step, and the second control step is a step of the first control. The communication port notified by the first video server is set to the second video server, and the first video server directly communicates with the second video server using the set communication port. A video transfer method, wherein the video data is transferred. 7. A video server capable of storing video data supplied via communication and transferring the stored video data to the outside via communication, wherein a predetermined communication protocol is used to store the video data. Communication means capable of transmitting video data transferred to the outside and receiving video data transferred from the outside; encoding means for encoding the video data in a predetermined format; and encoding the video data encoded in the predetermined format. Decoding means for decoding; storage means for storing the video data; monitoring the mounting state of the communication means, the encoding means, and the decoding means during the transfer of the video data by the communication means; Control means for controlling the transfer of the video data based on a state. Video server that. 8. The video server according to claim 7, wherein the communication protocol is FTP. 9. The video server according to claim 7, wherein as a pre-process of the transfer, it is checked whether or not the transfer destination video data can be accepted at a transfer destination of the transfer. server. 10. The video server according to claim 9, wherein the format of the transferred video data is checked. 11. The video server according to claim 9, wherein the mounting state of the transfer destination is checked.